IBM-AUSTRIA - PC-HW-Support    30 Aug 1999

PC SERVER runs SLOW while MIRRORING with NetWare

     Record number:       H136094
     Device:              D/T8640
     Model:               M
     Hit count:           UHC00141
     Success count:       USC0000
     Publication code:    PC50
     Tip key:
     Date created:        O97/01/14
     Date last altered:   A98/06/10
     Owning B.U.:         USA


Abstract: PC SERVER runs SLOW while MIRRORING with NetWare

SYMPTOM:

While Mirroring or Duplexing with NetWare, the Server runs slowly. Performance is degraded.

PROBLEM ISOLATION AIDS:

The system is a PC Server with one or more of the following Adaptec SCSI Adapters / Controller installed:

•  FRU P/N 06H5250 or FRU P/N 06H9610 PCI Fast SCSI-2 adapter
•  FRU P/N 06H6431 or FRU P/N 06H8574 (Option P/N 94G3771 or P/N 94G4673) PCI 2940W Wide adapter
•  FRU P/N 60H7823 (Option P/N 76H5407) 2940UW Ultra-wide adapter
•  A Onboard SCSI Adapter using the 7870 Chipset

FIX:

Edit the STARTUP.NCF so the loading of the Adaptec device drivers are as follows:

 For Duplexing:
    load aic7870.dsk slot=xx read_after_write=1     (primary drive)
    load aic7870.dsk slot=xx read_after_write=0    (mirrored drive)
 For Mirroring:
    load aic7870.dsk slot=xx read_after_write=0


By default (no parameters), read after write verification is ENABLED for the aic7870.dsk device driver.

By using the "read_after_write=0" parameter, read after write verification is DISABLED and system performance is improved. Read after write verification will appear "DISABLED" for the mirrored drive on the NetWare Monitor (Disk Information) screen when "read_after_write=0" is used as the parameter.

Adaptec is a trademark of Adaptec, Inc.
NetWare is a trademark of Novell, Inc.

Please see the LEGAL  -  Trademark notice.
Feel free - send a   for any BUG on this page found - Thank you.